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lowpass: symmetric code

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Robert Jördens 2021-02-10 13:31:41 +01:00
parent 13b47556fd
commit 8d68504026
1 changed files with 1 additions and 1 deletions
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dsp/src/lowpass.rs
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@ -25,7 +25,7 @@ impl<N: ArrayLength<i32>> Lowpass<N> {
// Note the zero(s) at Nyquist and the benign overflow (DF-I). // Note the zero(s) at Nyquist and the benign overflow (DF-I).
let mut x0 = x; let mut x0 = x;
let mut x1 = self.xy[0]; let mut x1 = self.xy[0];
self.xy[0] = x; self.xy[0] = x0;
for y1 in self.xy[1..].iter_mut() { for y1 in self.xy[1..].iter_mut() {
x0 = *y1 + (((x0 >> 1) + (x1 >> 1) - *y1 + (1 << (k - 1))) >> k); x0 = *y1 + (((x0 >> 1) + (x1 >> 1) - *y1 + (1 << (k - 1))) >> k);
x1 = *y1; x1 = *y1;